The easiest way to create Opportunities for partner companies (or schools or service partners)

Create an Opportunity and...

Set it to the "Private-Open" privacy setting

• Add the partner organization's name to the Opportunity title,
• Ask for "Company Affiliation" in the Extras section (Can't find this? You may need to upgrade to a Community or Professional Plan to access this feature).
• To track engagement, you'll be able to use the Attendance Exports or the automatically-created Group for that Opportunity.